Steam-valve.



UNITED sTATEsgriigiTEivT oEEicE.

-wiLiranD BAKER, or' ABEEDEEN, soii'rii DAKOTA.

v STEAM-VALVE.

To all 'whom 'it lmay concern.'

Be it known that fl, VVILEREUBAKER, a citizen of the United States, residing at Aberdeen, in the county of Brown and State 'of South Dakota, have invented a new and useful Steam-Valvdof which the following is a specification.

This invention relates to piston` valves for steam engines and the like and more particularly to a novel form of packing ring for preventing leaking of steam as the valve reclprocates Wit-hin the cage or casino'.

The object of the invention is to provide.

a piston valve the heads of which. may be adjusted longitudinally of `the connecting stein or core so as to change the lead or lap of the valve.

A further oh'ect is to'formeach head o 'the Valve with op'posltelyv disposed clamping disks or members which bear against and serve to lock the several packing rings in engagement with a central spacing member or collar.

A still further object off the invention is generally toi1nprove this class ot' devices so as toy increase their utility, duiiibilit)v and efficiency.

Further objects and advantages will appear in the following description, it being understood that various changes .in forni, proportions and ininordetai-ls of construction may be resorted to within the scopeof theappended claims.

In the accompanying drawings forming a part of this specitication: Figure 1 is a side elevation partly in section otl a piston valve constructed in accordance with my invention showing the same arranged within .the valve casing or cage. Fig. 2 is an eularged side elevation 'partly Ain section 'ot vthe valve detached. Fig. 3ds a perspective view of the valve with the' spacing collar and several clamping rings removed from` the adjacent end of th supportingsteni, one ofthe clamping disks comprising thc head being omitted. Fie'. 4 is a perspective view of one ofthe clamping heads dctached. Y

Specification of Letters Patent.

Application led'January 27, 1908. Serial No. 412,849

Patented 00t- 13, A1908.

Similar numerals of reference indicate corresponding parts 11i v`all of the figures ot the drawings.

'.lheimproved piston valve forming the subject mattei' of the present invention is principally designed for use in connectionV with steam engines and the like and by way oi illustration is shown in connection with a steam engine of the ordinary construction in which 5 designates the cylinder, G` the inlet ports and 7 the exhaust port leading to the valve casing or cage 8.

The valve consists of a connecting steml D preferably tubular in form, as shown, Vand provided with exterior threads 10 for en-n gagei'nent with the oppositely disposed heads ot the piston whereby said headsmay be adjusted longitudinally of the stein so as to change the lead or lap of the valve.

Each head of the piston is formed with oppositely disposed clamping members or disks 1l and 12 having circumferential `grooves 18 formed in 4their adjacent faces lor the reception ot' a centralspacing ring or coll'ar 14j Surrounding the clamping members 11 and l2 are main and auxiliary split' packing rings 15 and 16.01 diti'erent widths, the relatively narrow ring lG'being provided with an annular groove 17 for the reception `ot the adjacent end of the relatively wide ring 15 thereby to present a smooth unobstructed bearing surface for each head of the valve and also assist in preventing accidental displacement of the ring- 1G. The relatively narrow packing ring 1G is provided with an internal shoulder which enters a recess 19 formed in the clamping meinbcrll and normally bears `against said clamping member, as shown. Y

The shoulder 18 is spaced from the annular [lange 19 of the clamping member l1 to 'lorm a pocket for the reception of a supple- `mental or retaining ring 20, which latter serves to prevent the steam from leaking into the exhaust port or cavity when the valve travels between the inlet and exhaust ports. Extending inwardlytromthe main pack ing ring l5 is a shoulder 21 similar in construction to the shoulder 1S but preferably of less width than the latter, there being asupplemeiital retaining ring 22 bearing against the shoulder 2l and seated inthe annular recess Q3 of the clamping ring 12.

Ihc auxiliary packing ring 16 is split transversely to form a lap joint 24, which latter also intersects the shoulder 18, there being. a lap joint 25 formed in the retaining ring 2O and disposed in staggered relation with respect to the lap oint 24 so as to' prevent leakage. The main ring 15 is also splittransversely to form a lap j oint26 which intersects the shoulder 21 while the adjacent retaining ring 23 is provided with a lap joint 27 similar in construction to the lap joint 25 and disposed in spaced relation to the lap joint of the main ring l5.

The clamping disks 11 and 12 are provided with sockets 28 for the reception of a Spanner or other suitable tool whereby said members may be clamped in engagement with the centraly supporting ring er collar 14 and thus lock the several packing rings in assembled position so as to effectually prevent accidental displacement of thesame.

The clamping member 11 of one of the heads is provided with spaced guides preferably in the form of under cut ribs 29 .adapted to receive the adjacent end ofthe valve stem 30, which latter passes through the stufiing box 3l ofthe steam chest S2 in the usual manner. y

It will thus be seen that the opposite heads of the piston may be adjusted longitudinally of the connecting stem 9 so as to change the lead or lap of the valve while the clamping members of either head may be unscrewed from the stem 9 so as to permit the removal of any of the packing rings when the latter become worn or otherwise impaired from constant use.

Attention is here called to the fact that by having the main rino' l5 over lap the adj acent end of the auxi iary ring 16 a smooth unobstructed bearing surface is presented to the valve seat, while at the same time the auxiliary ring 16 is .prevented from springing or expanding laterally when theevalve is passed between ports.

valve constructed in accordance with the present invention is strong and durable in construction and thoroughly efficient in operation and will effectually prevent the es cape orleakage of steam at the periphery of the-piston heads.

Having thus described the invention what is claimed is: 1

1. A 'piston including a threaded stem, spaced heads engaging the threads on. the stem andiadjustable longitudinally of the latter, overelapping main and auxiliary split ringscarried by each head and each provided with an inwardly extending shoulder, and split retaining rings bearing against the shoulders.

2. A piston including a threaded stem, spaced heads engaging the threads on the stemjand adjustable longitudinally of the latter, main and auxiliary packing ringsjsurrounding each headand each provided with an inwardly extending shoulder, said rings being of different widths and split transversely, and split retaining rings bearing against the shoulders.

3. Apistoil including a stem, spaced heads mounted on the stem and. adjustable longitudinally of the latter, each head being formed of co-acting clamping members, i spacing collar interposed between the clamping members of each head, and transversely split packing rings surrounding each. head, said rings being of different widths and each provided with an inwardly extending shoulder bearing against the adjacent clamping member. I

.4. A piston including a stem, spaceduheads mounted on the .stem and adjustable longitudinally of the latter, said heads being cach formed with co-aeting clamping members, a spacing collar interposed between each set of clamping members, main and auxiliary packing rings surrounding the clamping members and each provi ed with an yinternal shoulder, said packing rings being of vdifferent widths and split transversely with the A adjacent ring, and split retaining rings surrounding the clamping members and bearing against the adjacent shoulders.

5. A piston including :L stem having external threads, ahead mounted on the stein andjincluding spaced clamping membersengaging the threads on said stem, a collar in terposed between the clamping members, main andauxiliary packing rings of different widths surrounding the clamping member and each provided with an internal shoulder, an expansible retaining ring interposed between one of the shoulders and the adjacent clamping ring and a similar ref taining ring interposed between the collar and the other shoulder.

6,. A piston including an externally'threaded stem, a head including co-acting clamping members engaging the `threads' on the stem and provided with Y registering annular grooves, a i spacing collar seated in said grooves, there being recesses formed in the clamping members adjacent `vsaid grooves, split rings of different widths surrounding the clamping members and each provided with an internal shoulder seated within the adjacent recess, and expansible retaining members surrounding the clamping members and bearing against the adjacent shoulders.

7. A piston' including a stem, a 'head mounted on the stem and comprising spaced clampingA members having their adjacent faces provided with circumferential grooves adapted to register with each other, a spacing cellar seated in the grooves, there being a recess formed in each clamping member adjacent the groove, over-lapping packing rings 'of different Widths surrounding the clamping members and each provided with an internal shoulder seted'within the recess rny be' locked in' engagement with the spaeof the adjacent clamping member, sai-d packing collar.

ing rings`being provided with lap joints, re- Intestimony-that elaiin the foregoingas L2 taining rings bearing against the shoulders vrnyovc'fn, I have heretojaxed. mysigneture 5 and profidei with lp joints disposed1 in in the presence of twowitnesses.jl

v .staggere re ation Wi h' respect to the ap.

joints ofl the lRacking rings, there being t. sockets formed 1n the exterior faces of the l 'Witnessesz 1 'r l clamping members forthe reception of a .l PARKERH; LYONS.y

10 Spanner whereby said clamping membersl I C. A'. RUSSELL.' 

